An electrical power plant manages to send 90% of the heat produced in the burning of fossil fuel into the water-to-steam conversion. Of the heat carried by the steam, 40% is converted to the mechanical energy of the spinning turbine. Which of the following choices best describes the overall efficiency of the heat-to-work conversion in the plant (as a percentage)?

a. greater than 90%
b. 65%
c. less than 40%
d. 40%
e. 90%


c

Physics & Space Science

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While yet unseen, some gravitational evidence suggests the existence of dark galaxies

Indicate whether the statement is true or false

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Motorcycle Mike is traveling behind an ambulance with a speed of 40 mph. The ambulance, traveling in the same direction, has a speed of 70 mph. When Mike hears the ambulance's siren, the frequency is _______ the actual frequency.

A. higher than B. the same as C. lower than

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One of the rare galaxies that is isolated in space is likely to be a(n) ____

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